xfs_parent_calc_space_res
ret += xfs_parent_calc_space_res(mp, src_namelen);
ret += 2 * xfs_parent_calc_space_res(mp, target_namelen);
ret += xfs_parent_calc_space_res(mp, target_namelen);
ret += xfs_parent_calc_space_res(mp, namelen);
ret += xfs_parent_calc_space_res(mp, namelen);
ret += xfs_parent_calc_space_res(mp, namelen);
ret += xfs_parent_calc_space_res(mp, namelen);
unsigned int xfs_parent_calc_space_res(struct xfs_mount *mp,